266 ON THE MOLLUSCAN GENUS COCHLITOMA. 



does not fall into line in the character of its penis sheath. These 

 two forms also appear to be separate from the other forms in 

 respect of the jaw (v. supra). Conchologically some of the forms 

 included are indistinguishable from Achatina (s. s.). We there- 

 fore conclude that the present conception of the genus Cochlitoma 

 is unsound. Fresh data are, however, necessary before a final 

 arrangement of the forms involved can be made. 



Literature cited. 



Amaudrut. 1886. — "Systeme nerveux des quelques Mollusques 



pulmones." Bull. Soc. Philomath. Paris, (7) x, 



p. 107. 

 Connolly. 1912. — "Reference list of South African non-marine 



Mollusca.'" Ann. South African Mus. xi. pt. 3, 



p. 59. 

 Deshayes. 1821.— Histoire nat. Moll. Atlas (2) pi. 127. 

 Ferussac. 1821.— Prodromus (Tabl. Syst. Moll.) p. 52. 

 Nabias. 1894. — " Recherches sur les centres nerveux des Gaste- 



ropodes." Actes Soc. Linn. Bordeaux, (5) xlvii. 



t. 7. p. 11. 

 Pfetffer. 1854. — "Neue Heliceen." Malak. Blatt., Cassel, i. 



p. 224. 

 Pilsbry. 1904. — Tryon's Manual of Conchology, Philadelphia, 



(2) xvii. passim. 

 ,, 1912. — The same, (2) xxii. p. xxix. 



1919.—" Land Mollusks of the Belgian Congo." Bull. 



Am. Mus. N. Hist. New York, xl. art. 1, p. 1. 

 Plate. 1896. — "Anatomie cles Bulimus ovatus, etc." Sitz. Ges. 



Naturf. Freunde, Berlin, p. 232. 

 Semper. 1870. — Reisen . . . Archipel d. Philippinen, Wiesbaden, 



Th. ii. Bd. 3. p. 144. 

 Wiegmann. 1898. — (v. Martens & Wiegmann), " Mollusken der 



Seychelles" Mitth. Zool. Mus. Berlin, i. p. 38. 

 " X " (Cummings & Robson). 1 914. — "Taxonomy and Evolution." 



American Naturalist, New York, xlviii. p. 369. 



